. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 20 40 60 80 20 40 60 80 Units of DNA FIGURE 7. Distribution of DNA in mass cultures and isolated cells. (A) Culture I, one day old (log phase). Amount of DNA in 50 dividing daughters (each from a different pair). Range to ; mean ± S. D.; mode 17. (B) Culture I, one week old (stationary phase). Amount of DNA in 50 cells. Range to ; mean ± S. D.; mode 32. (C) Culture I, two weeks old. Amount of DNA in 50 cells. Range to ; mean ± S. D.; mode 32. (D) Culture II, one day ol
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 20 40 60 80 20 40 60 80 Units of DNA FIGURE 7. Distribution of DNA in mass cultures and isolated cells. (A) Culture I, one day old (log phase). Amount of DNA in 50 dividing daughters (each from a different pair). Range to ; mean ± S. D.; mode 17. (B) Culture I, one week old (stationary phase). Amount of DNA in 50 cells. Range to ; mean ± S. D.; mode 32. (C) Culture I, two weeks old. Amount of DNA in 50 cells. Range to ; mean ± S. D.; mode 32. (D) Culture II, one day old (log phase) (subculture of one-week old Culture I). Amount of DNA in 50 dividing daughters (each from a different pair). Range to ; mean ± S. D.; mode 22. (E) Isolated dividing daughters. Amount of DNA in 173 cells (83 pairs and 7 individuals). Range to ; mean ± S. D.; mode 22. lation) was fixed and stained. One daughter nucleus of each of 50 dividing pairs (similar to stage 4, Fig. 6) was measured; presumably these values would indicate the basic, or minimal, amount of DNA. (Since the cytoplasm was invisible, criteria for dividing daughters were shape and appearance of nuclei—two rather tear-shaped and granular-looking nuclei, usually with part of a strand of chromatin extending from one toward the other.) One week later this culture, in stationary phase, was sampled again, and 50 nuclei were measured. At the same time, a subculture (II) was inoculated from Culture I. Twenty-four hours later Culture II was sampled, and 50 of its dividing daughters were measured. When Culture I was two weeks old it was sampled again, and 50 more nuclei were Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biolog
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
